Manganese-steel mold.



' H. HOWE. MANGANESE STEEL MOLD.

APPLICATION FILED P151144, 1907.

Patented Mar. 2, 1909.

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By his Attorney UNITED stares earner enrich.

HENRY M. HOWE, OF BEDFORD, NEW YORK, ASSIGNOR TO TAYLOR IRON & STEEL COMPANY, OF HIGH BRIDGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MAN GANESE-STEEL MOLD.

Application filed February 14, 1907.

ToaZZ whom it may concern:

Be it known that I, HENRY M. HOWE, a citizen of the United States, residing in Bedford, in the county of WVestchester and State of New York, have invented certain new and useful Improvements in Manganese- Steel Molds, of which the following is a specification.

This invention relates to molds for casting, the object of the invention being to provide a manganese steel mold.

In the drawings accompanying and forming part of this specification, Figure 1 illusstrates one half of a mold, it representing in this instance a mold for an anvil, the view showing the interior thereof, the other half being the same; Fig. 2 is an end view of the two sections clamped together in readiness to receive the molten metal; Fig. 3 is a view similar to Fig. 1, but illustrates one half of the mold provided with a lining; and Fig. 4 is a cross sectional view of a mold of the form shown in Fig, 3.

Similar characters of reference indicate corresponding parts throughout the several figures of the drawings.

One of the great demands in iron foundries is for a permanent mold instead of the usual sand mold, and many efforts have been made to secure such a mold, the objection to making a permanent mold of ordinary cast iron or steel being that it chills the casting. Hence the mold has to be lined with a thick non-conducting lining. This lining must be thick because the metal conducts heat very rapidly. Manganese steel, however, is free from this disadvantage, because it is a very poor conductor of heat. Consequently the separate non conducting lining for a mold made from this metal can be very much thinner than when the mold is made of the steel or iron heretofore used for that purpose.

It will be understood that the molds may be made of the shape desired for the particular casting to be produced. In the drawings I have shown a mold for an anvil, Fig. 1 representing a part of the mold, Fig. 2 the two parts thereof, which are made alike, properly clamped together in the usual manner. For this purpose one section of the mold 2 is provided with ears or lugs 3.having openings therein for the reception of Specification of Letters Patent.

Patented March 2, 1909.

Serial No. 357,326.

pins at which project in this instance into recesses 5 at the front and rear of the mold. Figs. 3 and i show the same mold provided with a lining 6 which is held in place by overlapping it over the edge of the mold as at 7, Figs. 3 and 4-.

In making the mold of manganese steel, in order to toughen the steel and render it effective for use, it is necessary that the same be heat treated, that is, be first heated up to a predetermined temperature and then suddenly cooled, as by immersion in water. Any of the several modes of heat treatment heretofore patented may be used for this purpose. That which I prefer, however, as giving the best satisfaction is the one invented and patented by lValter Brinton. For the purpose of heat treating the mold, it is highly desirable that the Walls of the casting be uniform, since otherwise the heat treatment is not so effective, and in fact unless the mold is formed with some appreciable degree of uniformity it is not practicable to heat treat it at all, because the heat treatment will not be uniform and in consequence strains will be set up within the mass and the mold be practically useless. Therefore, in forming the mold of manganese steel it is desirable that not only the interior thereof conform to the shape of the casting to be made, but that the exterior thereof likewise so conform.

The mold may be lined with any desired character of lining, and in the form shown this relatively thin lining 6 is bent over the edges of the half sections of the mold as at 7, Figs. 3 and 4t. The advantages in the use of a lining are that it prevents themold itself from being cut and also retards the cooling of the casting. In some instances instead of using a lining the manganese steel may be simply coated with a clay wash to prevent adherence.

By forming the mold of manganese steel, I am able to provide a mold in which, because of the character of the metal, the castings do not become chilled as in the ordinary steel or iron mold, and in the use of which the lining may be very much thinner than is usually the case.

In practice the mold is slightly preheated, the metal then cured in, and as soon as it becomes set sufiieiently to permit handling metal having a low heat conductivity and provided with a relatively thin lining of some appreciable body.

2. A manganese steel mold having its- Walls substantially uniform and heat treated by sub eCting it to heat and quenching 111 Water.

3. A. manganese steel mold having its Walls substantially uniform and heat treated by subj ectin it to heat and quenching in Water, and provided- With a relatively thin lining of some appreciable body.

4. A manganese steel mold having its walls substantially uniform throughout, the exterior as Well as the interior of said mold substantially conforming to the shape of the castingto be made, heat treated by subjecting it to heat and quenching in Water, and provided with a relatively thin lining bent or shaped to conform to the inner Walls of the mold.

' i-ini aY M. i-iovvn. Witnesses EDWIN ZITTEL, CHARLOTTE SnGLnR. 

